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597 lines
17 KiB
597 lines
17 KiB
const EventEmitter = require('events')
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const $ = require('../lib/chibi')
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const { mk, qs } = require('../utils')
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const notify = require('../notif')
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const ScreenParser = require('./screen_parser')
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const ScreenRenderer = require('./screen_renderer')
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module.exports = class TermScreen extends EventEmitter {
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constructor () {
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super()
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this.canvas = mk('canvas')
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this.ctx = this.canvas.getContext('2d')
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this.parser = new ScreenParser(this)
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this.renderer = new ScreenRenderer(this)
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// debug screen handle
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this._debug = null
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if ('AudioContext' in window || 'webkitAudioContext' in window) {
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this.audioCtx = new (window.AudioContext || window.webkitAudioContext)()
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} else {
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console.warn('No AudioContext!')
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}
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// dummy. Handle for Input
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this.input = new Proxy({}, {
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get () {
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return () => console.warn('TermScreen#input not set!')
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}
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})
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// dummy. Handle for Conn
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this.conn = new Proxy({}, {
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get () {
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return () => console.warn('TermScreen#conn not set!')
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},
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set (a, b) {
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return () => console.warn('TermScreen#conn not set!')
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}
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})
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this.cursor = {
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x: 0,
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y: 0,
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blinking: true,
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visible: true,
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hanging: false,
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style: 'block'
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}
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this._window = {
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width: 0,
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height: 0,
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devicePixelRatio: 1,
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fontFamily: '"DejaVu Sans Mono", "Liberation Mono", "Inconsolata", "Menlo", monospace',
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fontSize: 20,
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padding: 6,
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gridScaleX: 1.0,
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gridScaleY: 1.2,
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fitIntoWidth: 0,
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fitIntoHeight: 0,
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debug: false,
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graphics: 0,
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statusScreen: null
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}
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// scaling caused by fitIntoWidth/fitIntoHeight
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this._windowScale = 1
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// actual padding, as it may be disabled by fullscreen mode etc.
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this._padding = 0
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// properties of this.window that require updating size and redrawing
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this.windowState = {
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width: 0,
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height: 0,
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devicePixelRatio: 0,
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padding: 0,
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gridScaleX: 0,
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gridScaleY: 0,
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fontFamily: '',
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fontSize: 0,
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fitIntoWidth: 0,
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fitIntoHeight: 0
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}
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// current selection
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this.selection = {
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// when false, this will prevent selection in favor of mouse events,
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// though alt can be held to override it
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selectable: true,
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// selection start and end (x, y) tuples
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start: [0, 0],
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end: [0, 0]
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}
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// mouse features
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this.mouseMode = { clicks: false, movement: false }
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// make writing to window update size and draw
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const self = this
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this.window = new Proxy(this._window, {
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set (target, key, value, receiver) {
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target[key] = value
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self.scheduleSizeUpdate()
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self.renderer.scheduleDraw(`window:${key}=${value}`)
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self.emit(`update-window:${key}`, value)
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return true
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}
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})
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this.bracketedPaste = false
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this.blinkingCellCount = 0
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this.reverseVideo = false
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this.screen = []
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this.screenFG = []
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this.screenBG = []
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this.screenAttrs = []
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let selecting = false
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let selectStart = (x, y) => {
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if (selecting) return
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selecting = true
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this.selection.start = this.selection.end = this.screenToGrid(x, y, true)
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this.renderer.scheduleDraw('select-start')
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}
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let selectMove = (x, y) => {
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if (!selecting) return
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this.selection.end = this.screenToGrid(x, y, true)
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this.renderer.scheduleDraw('select-move')
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}
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let selectEnd = (x, y) => {
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if (!selecting) return
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selecting = false
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this.selection.end = this.screenToGrid(x, y, true)
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this.renderer.scheduleDraw('select-end')
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Object.assign(this.selection, this.getNormalizedSelection())
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}
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// bind event listeners
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this.canvas.addEventListener('mousedown', e => {
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if ((this.selection.selectable || e.altKey) && e.button === 0) {
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selectStart(e.offsetX, e.offsetY)
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} else {
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this.input.onMouseDown(...this.screenToGrid(e.offsetX, e.offsetY),
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e.button + 1)
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}
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})
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window.addEventListener('mousemove', e => {
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selectMove(e.offsetX, e.offsetY)
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})
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window.addEventListener('mouseup', e => {
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selectEnd(e.offsetX, e.offsetY)
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})
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// touch event listeners
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let touchPosition = null
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let touchDownTime = 0
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let touchSelectMinTime = 500
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let touchDidMove = false
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let getTouchPositionOffset = touch => {
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let rect = this.canvas.getBoundingClientRect()
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return [touch.clientX - rect.left, touch.clientY - rect.top]
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}
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this.canvas.addEventListener('touchstart', e => {
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touchPosition = getTouchPositionOffset(e.touches[0])
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touchDidMove = false
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touchDownTime = Date.now()
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}, { passive: true })
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this.canvas.addEventListener('touchmove', e => {
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touchPosition = getTouchPositionOffset(e.touches[0])
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if (!selecting && touchDidMove === false) {
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if (touchDownTime < Date.now() - touchSelectMinTime) {
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selectStart(...touchPosition)
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}
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} else if (selecting) {
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e.preventDefault()
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selectMove(...touchPosition)
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}
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touchDidMove = true
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})
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this.canvas.addEventListener('touchend', e => {
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if (e.touches[0]) {
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touchPosition = getTouchPositionOffset(e.touches[0])
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}
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if (selecting) {
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e.preventDefault()
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selectEnd(...touchPosition)
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// selection ended; show touch select menu
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let touchSelectMenu = qs('#touch-select-menu')
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touchSelectMenu.classList.add('open')
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let rect = touchSelectMenu.getBoundingClientRect()
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// use middle position for x and one line above for y
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let selectionPos = this.gridToScreen(
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(this.selection.start[0] + this.selection.end[0]) / 2,
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this.selection.start[1] - 1
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)
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selectionPos[0] -= rect.width / 2
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selectionPos[1] -= rect.height / 2
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touchSelectMenu.style.transform = `translate(${selectionPos[0]}px, ${
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selectionPos[1]}px)`
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}
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if (!touchDidMove && !this.mouseMode.clicks) {
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this.emit('tap', Object.assign(e, {
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x: touchPosition[0],
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y: touchPosition[1]
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}))
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}
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touchPosition = null
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})
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this.on('tap', e => {
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if (this.selection.start[0] !== this.selection.end[0] ||
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this.selection.start[1] !== this.selection.end[1]) {
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// selection is not empty
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// reset selection
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this.selection.start = this.selection.end = [0, 0]
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qs('#touch-select-menu').classList.remove('open')
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this.renderer.scheduleDraw('select-reset')
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} else {
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e.preventDefault()
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this.emit('open-soft-keyboard')
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}
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})
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$.ready(() => {
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let copyButton = qs('#touch-select-copy-btn')
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if (copyButton) {
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copyButton.addEventListener('click', () => {
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this.copySelectionToClipboard()
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})
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}
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})
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this.canvas.addEventListener('mousemove', e => {
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if (!selecting) {
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this.input.onMouseMove(...this.screenToGrid(e.offsetX, e.offsetY))
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}
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})
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this.canvas.addEventListener('mouseup', e => {
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if (!selecting) {
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this.input.onMouseUp(...this.screenToGrid(e.offsetX, e.offsetY),
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e.button + 1)
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}
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})
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this.canvas.addEventListener('wheel', e => {
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if (this.mouseMode.clicks) {
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this.input.onMouseWheel(...this.screenToGrid(e.offsetX, e.offsetY),
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e.deltaY > 0 ? 1 : -1)
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// prevent page scrolling
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e.preventDefault()
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}
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})
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this.canvas.addEventListener('contextmenu', e => {
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if (this.mouseMode.clicks) {
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// prevent mouse keys getting stuck
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e.preventDefault()
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}
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selectEnd(e.offsetX, e.offsetY)
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})
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}
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/**
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* Schedule a size update in the next millisecond
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*/
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scheduleSizeUpdate () {
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clearTimeout(this._scheduledSizeUpdate)
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this._scheduledSizeUpdate = setTimeout(() => this.updateSize(), 1)
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}
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/**
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* Returns a CSS font string with this TermScreen's font settings and the
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* font modifiers.
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* @param {Object} modifiers
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* @param {string} [modifiers.style] - the font style
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* @param {string} [modifiers.weight] - the font weight
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* @returns {string} a CSS font string
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*/
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getFont (modifiers = {}) {
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let fontStyle = modifiers.style || 'normal'
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let fontWeight = modifiers.weight || 'normal'
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return `${fontStyle} normal ${fontWeight} ${this.window.fontSize}px ${this.window.fontFamily}`
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}
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/**
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* Converts screen coordinates to grid coordinates.
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* @param {number} x - x in pixels
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* @param {number} y - y in pixels
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* @param {boolean} rounded - whether to round the coord, used for select highlighting
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* @returns {number[]} a tuple of (x, y) in cells
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*/
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screenToGrid (x, y, rounded = false) {
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let cellSize = this.getCellSize()
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x = x / this._windowScale - this._padding
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y = y / this._windowScale - this._padding
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return [
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Math.floor((x + (rounded ? cellSize.width / 2 : 0)) / cellSize.width),
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Math.floor(y / cellSize.height)
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]
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}
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/**
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* Converts grid coordinates to screen coordinates.
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* @param {number} x - x in cells
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* @param {number} y - y in cells
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* @param {boolean} [withScale] - when true, will apply window scale
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* @returns {number[]} a tuple of (x, y) in pixels
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*/
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gridToScreen (x, y, withScale = false) {
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let cellSize = this.getCellSize()
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return [x * cellSize.width, y * cellSize.height].map(v => this._padding + (withScale ? v * this._windowScale : v))
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}
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/**
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* The character size, used for calculating the cell size. The space character
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* is used for measuring.
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* @returns {Object} the character size with `width` and `height` in pixels
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*/
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getCharSize () {
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this.ctx.font = this.getFont()
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return {
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width: Math.floor(this.ctx.measureText(' ').width),
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height: this.window.fontSize
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}
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}
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/**
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* The cell size, which is the character size multiplied by the grid scale.
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* @returns {Object} the cell size with `width` and `height` in pixels
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*/
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getCellSize () {
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let charSize = this.getCharSize()
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return {
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width: Math.ceil(charSize.width * this.window.gridScaleX),
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height: Math.ceil(charSize.height * this.window.gridScaleY)
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}
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}
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/**
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* Updates the canvas size if it changed
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*/
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updateSize () {
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// see below (this is just updating it)
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this._window.devicePixelRatio = Math.ceil(this._windowScale * (window.devicePixelRatio || 1))
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let didChange = false
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for (let key in this.windowState) {
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if (this.windowState.hasOwnProperty(key) && this.windowState[key] !== this.window[key]) {
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didChange = true
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this.windowState[key] = this.window[key]
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}
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}
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if (didChange) {
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const {
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width,
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height,
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fitIntoWidth,
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fitIntoHeight,
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padding
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} = this.window
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const cellSize = this.getCellSize()
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// real height of the canvas element in pixels
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let realWidth = width * cellSize.width
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let realHeight = height * cellSize.height
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let originalWidth = realWidth
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if (fitIntoWidth && fitIntoHeight) {
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let terminalAspect = realWidth / realHeight
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let fitAspect = fitIntoWidth / fitIntoHeight
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if (terminalAspect < fitAspect) {
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// align heights
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realHeight = fitIntoHeight - 2 * padding
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realWidth = realHeight * terminalAspect
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} else {
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// align widths
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realWidth = fitIntoWidth - 2 * padding
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realHeight = realWidth / terminalAspect
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}
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}
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// store new window scale
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this._windowScale = realWidth / originalWidth
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realWidth += 2 * padding
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realHeight += 2 * padding
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// store padding
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this._padding = padding * (originalWidth / realWidth)
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// the DPR must be rounded to a very nice value to prevent gaps between cells
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let devicePixelRatio = this._window.devicePixelRatio = Math.ceil(this._windowScale * (window.devicePixelRatio || 1))
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this.canvas.width = (width * cellSize.width + 2 * Math.round(this._padding)) * devicePixelRatio
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this.canvas.style.width = `${realWidth}px`
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this.canvas.height = (height * cellSize.height + 2 * Math.round(this._padding)) * devicePixelRatio
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this.canvas.style.height = `${realHeight}px`
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// the screen has been cleared (by changing canvas width)
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this.renderer.resetDrawn()
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// draw immediately; the canvas shouldn't flash
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this.renderer.draw('update-size')
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}
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}
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/**
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* Returns a normalized version of the current selection, such that `start`
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* is always before `end`.
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* @returns {Object} the normalized selection, with `start` and `end`
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*/
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getNormalizedSelection () {
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let { start, end } = this.selection
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// if the start line is after the end line, or if they're both on the same
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// line but the start column comes after the end column, swap
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if (start[1] > end[1] || (start[1] === end[1] && start[0] > end[0])) {
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[start, end] = [end, start]
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}
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return { start, end }
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}
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/**
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* Returns whether or not a given cell is in the current selection.
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* @param {number} col - the column (x)
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* @param {number} line - the line (y)
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* @returns {boolean}
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*/
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isInSelection (col, line) {
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let { start, end } = this.getNormalizedSelection()
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let colAfterStart = start[0] <= col
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let colBeforeEnd = col < end[0]
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let onStartLine = line === start[1]
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let onEndLine = line === end[1]
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if (onStartLine && onEndLine) return colAfterStart && colBeforeEnd
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else if (onStartLine) return colAfterStart
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else if (onEndLine) return colBeforeEnd
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else return start[1] < line && line < end[1]
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}
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/**
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* Sweeps for selected cells and joins them in a multiline string.
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* @returns {string} the selection
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*/
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getSelectedText () {
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const screenLength = this.window.width * this.window.height
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let lines = []
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let previousLineIndex = -1
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for (let cell = 0; cell < screenLength; cell++) {
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let x = cell % this.window.width
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let y = Math.floor(cell / this.window.width)
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if (this.isInSelection(x, y)) {
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if (previousLineIndex !== y) {
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previousLineIndex = y
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lines.push('')
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}
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lines[lines.length - 1] += this.screen[cell]
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}
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}
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return lines.join('\n')
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}
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/**
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* Copies the selection to clipboard and creates a notification balloon.
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*/
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copySelectionToClipboard () {
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let selectedText = this.getSelectedText()
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// don't copy anything if nothing is selected
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if (!selectedText) return
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let textarea = mk('textarea')
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document.body.appendChild(textarea)
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textarea.value = selectedText
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textarea.select()
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if (document.execCommand('copy')) {
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notify.show('Copied to clipboard')
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} else {
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notify.show('Failed to copy')
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}
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document.body.removeChild(textarea)
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}
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/**
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* Shows an actual notification (if possible) or a notification balloon.
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* @param {string} text - the notification content
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*/
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showNotification (text) {
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console.info(`Notification: ${text}`)
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if (window.Notification && window.Notification.permission === 'granted') {
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let notification = new window.Notification('ESPTerm', {
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body: text
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})
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notification.addEventListener('click', () => window.focus())
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} else {
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if (window.Notification && window.Notification.permission !== 'denied') {
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window.Notification.requestPermission()
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} else {
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// Fallback using the built-in notification balloon
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notify.show(text)
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}
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}
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}
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/**
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* Creates a beep sound.
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*/
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beep () {
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const audioCtx = this.audioCtx
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if (!audioCtx) return
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// prevent screeching
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if (this._lastBeep && this._lastBeep > Date.now() - 50) return
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this._lastBeep = Date.now()
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if (!this._convolver) {
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this._convolver = audioCtx.createConvolver()
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let impulseLength = audioCtx.sampleRate * 0.8
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let impulse = audioCtx.createBuffer(2, impulseLength, audioCtx.sampleRate)
|
|
for (let i = 0; i < impulseLength; i++) {
|
|
impulse.getChannelData(0)[i] = (1 - i / impulseLength) ** (7 + Math.random())
|
|
impulse.getChannelData(1)[i] = (1 - i / impulseLength) ** (7 + Math.random())
|
|
}
|
|
this._convolver.buffer = impulse
|
|
this._convolver.connect(audioCtx.destination)
|
|
}
|
|
|
|
// main beep
|
|
const mainOsc = audioCtx.createOscillator()
|
|
const mainGain = audioCtx.createGain()
|
|
mainOsc.connect(mainGain)
|
|
mainGain.gain.value = 4
|
|
mainOsc.frequency.value = 750
|
|
mainOsc.type = 'sine'
|
|
|
|
// surrogate beep (making it sound like 'oops')
|
|
const surrOsc = audioCtx.createOscillator()
|
|
const surrGain = audioCtx.createGain()
|
|
surrOsc.connect(surrGain)
|
|
surrGain.gain.value = 2
|
|
surrOsc.frequency.value = 400
|
|
surrOsc.type = 'sine'
|
|
|
|
mainGain.connect(this._convolver)
|
|
surrGain.connect(this._convolver)
|
|
|
|
let startTime = audioCtx.currentTime
|
|
mainOsc.start()
|
|
mainOsc.stop(startTime + 0.5)
|
|
surrOsc.start(startTime + 0.05)
|
|
surrOsc.stop(startTime + 0.8)
|
|
|
|
let loop = function () {
|
|
if (audioCtx.currentTime < startTime + 0.8) window.requestAnimationFrame(loop)
|
|
mainGain.gain.value *= 0.8
|
|
surrGain.gain.value *= 0.8
|
|
}
|
|
loop()
|
|
}
|
|
|
|
load (...args) {
|
|
this.parser.load(...args)
|
|
}
|
|
}
|
|
|